Christianson had joined CSFB from Morgan Stanley, where she was an executive director and Beijing chief representative.

She will be a member of Morgan Stanley's Asia Pacific executive committee.

Christianson, who was educated in the US, has advised on a number of landmark transactions in China, including the initial public offerings of China Life and China Oilfield Services.

Morgan Stanley has raised $34.6bn (€28.5bn) for Chinese clients in the international capital markets since 2000, according to the firm, and has advised on M&A transactions and restructuring transactions in the country worth $35.1bn during the same period.